@article{10_14708_cm_v52i1_5322,
     author = {Monika Herzog},
     title = {Approximation of functions of two variables by modified {Szasz-Mirakyan} operators},
     journal = {Commentationes Mathematicae},
     pages = { 3--9},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {2012},
     doi = {10.14708/cm.v52i1.5322},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v52i1.5322/}
}